Gas-burning apparatus



April 29, 1930. G. c. CARNAHAN GAS BURNING APPARATUS Filed July 12, 1928 W C W Z 5 p m r I x]! \x ,1 145.453! .li rLE/LCECCCECEEILE'LCCILCCEECCECFLCCECILILILECEC\LFLILCCFLEECEEEEEEEEILEE 20 the pilot.

Patented Apr. 29, 193G v UNITED STATES GLEN C. CARNAHAN,

OF CHICAGO, ILLINOIS,

GAS-BURNING APPARATUS Application filed July 12,

This invention relates in general to fuel burning devices, and while the principles thereof are capable of main various apparatus, I have shown the inventlon herein for illustrative purposes as incorporated in a gasburning heating apparatus.

.An apparatus of this characteruncludes a combustion chamber and if the pilot light should become extin uished, it is customarily manually relighted rom the front of the apparatus. Should there be an accumulatlon of gas in the combustion chamber, the llghting of the pilot light will produce an ex losion of greater or less intens1ty,-depen ing 16 upon the amount of gas accumulated 111 the chamber. Explosions thus produced have in some instances caused the flame to shoot out of the front opening of the chamber w th unfortunate results to the person rellghtmg One of the primary purposes of my present invention is to provide for relief of the pres sure produced in the combustion chamber by such \an explosion so as to preventthe flames from issuing at the front of the furnace and causing injury to the operator.

Other objects and advantages of th1s 1nvention will be apparent as the same becomes better understood from reference to the following description when considered in connection with the accompanying drawlngs, the single figure of which is a vertical sectional view through a heating apparatus equipped with my invention. I I 35' Referring to the drawings more in detall,

reference character 5 indicates the base of a fuel burning apparatus above which 1s disposed the combustion chamber 6 formed by the bottom wall 7, the front and rear end walls 8 and 9 respectively, and the side Walls (not shown). 0

Within the combustion chamber is mounted one or more burners 11 supplied with a combustible mixture from the mixer 12 and ignited by a pilot burner 13 which heats a thermostatic element 14 controlling a shutas valve in the chamber '15 disposed in the gas supply pi e 16. The construction thus far described orms the sub1ect matter of my copending applications, Serial 0. 290,895,

1928. serial No. 292,243.

filed July 7, 1928, and Serial No. 290,896, filed July 7, 1928.

While the extinguishment of the pilot light results in shutting off the gas supply to the main burners, a small amount of gas will con- OF CHICAGO, ILLINOIS, ASSIGNOB T0 JAMES B. GLOW 6n SONS,

A CORPORATION OF ILLINOIS tinue to escape into the combustion chamber 7,

from the pilot burner, and if this continues for some time, a considerable quantity of gas may accumulate in the combustion chamber. VV-hen the operator introduces a flame through the opening 16 above the pilot burner to relight the same, this gas in the combustion chamber will be ignited and an explosion will result.

To obviate danger to the operator, the combustion chamber is provided with a relief device in the form of a swinging door or flap 17 suspended from a pivot or pivots- 18 at the rear end of the combustion cham ber. The lower edge of this door normally rests under the influence of gravity against the outer edge of a flange or ledge 18 so that the opening is completely closed.

In the event of an explosion, however,'the door will swing outwardly and upwardly into the dottedline position shown, affording-- a relief for the pressure generated within the combustion chamber so that the flame is not blown out through the front of the chamber.

The opening 16 in the front wallof the chamber is shielded bya pivoted door or shield 19 suspended from the pivot or pivots 21 so that it may be swung inwardly and upwardly when desired for access to the interior of the chamber, but normally it assumes the position shown on the drawings and in the event of an explosion in the chamber will be forced into this position so as to prevent in a very large measure flames from issuin at the front of the apparatus.

It should e apparent from the fore oing that in the event ofan explosion the ames will be revented from shooting out the front of the urnace and burning the operator, and the pressure in the combustion chamber will be relieved by the door or flap 17 fat the rear of the apparatus where flames, if they should issue, can do no harm.

The structural details illustrated and de, scribed may obviously be varied within considerable limits without defarture from the essence of the invention as efined in the following claim.

chamber and pivotally mounted for swingin inwardly only of said chamber.

I lln witness of the foregoing I aflix my signature.

' GLEN C. CAltNAHAN. 

